question_answer

In the given figure the loop is fixed but straight wire can move. The straight wire will

A)  remain stationary

B)  move towards the loop

C)  move away from the loop

D)  rotates about the axis

Correct Answer: B

Solution :

If we consider a small element dl (as below) the magnetic force will be on left side, on the symmetric opposite part will be away from the wire but first one is greater.